Dreamcast Slow boot-up and freezing

[aykiri1]

Hello all

i have a dreamcast pal with VA1 mainboard
yesterday a problem occured. when i powered it booting up very slowly (in 1 minute)

after dreamcast logo appeared fully white screen shows
and nothing

i tested with and without GDROM board same result

meusured voltages. 5v=5.03 3.3v=3.3 12v=14.7 (after replace caps 13.1)
same results.

any suggest ?
br